Head motion for looms



Sept; 20, 1 932. v ATWQQD ET AL 1,877,759

HEAD MOTION FOR Loolls FilOd Fb. 8, 1929 3 sheets-esheat 1 NVENTORJ Jbel H. J7 Carl 3. From!" ATYORNEY 5613!. 2.0, 1 J. H. 'ATWOOD ETAL HEAD IO'I'IUN FOR LOOKS Filed Fyb. .8, 1929 I5 Sheets-Sheet 3 Carl, S. Proctor ATTORN EY WITNESSES BY M A Patented Sept. 20, 1932 UNITED STATES PATENT; OFFICE" JOEL HAROLD ATWOOID AND CARL s. rnoeron, or AYER, MASSACHUSETTS, ASSIGNORS T0 Enrrn n. PRIEST, or AYEB, MASSACHUSETTS HEAD MOTION FOR Looms Application filed February 8, 1929. Serial No. 338,544.

This invention relates to head motions for looms, an object of the invention being to provide a single toothed cylinder for positively moving the harnesses both in their up and down movements and positively locking the harnesses in these positions for the desired length of time.

Our invention has many advantages over head motions such as heretofore employed, some of which may be enumerated as follows: We eliminate the necessity for a vibrator gear, vibrator lever and vibrator connector, such as commonly employed.

e employ a single direct cylinder connector which reduces and practically eliminates the extensive maintenance costs now ex istent on many types of harness motion.

The direct cylinder connector design makes it possible to. runthe' head motion twice as fast as other motions due to the fact that the number of operating parts is greatly reduced lNith our improved mechanism there is no snap or vibration on the warp threads.

The speed of the cylinder is timed one revolution to four revolutions of the crank shaft.

With these and other objects in view, the invention consists in certainnovel features of construction and combinations and arrangements of parts, which will be more fully hereinafter described and" pointed out in the claims. p

Inthe accompanying drawings Figure 1 is a view, in elevation showinga loom frame with harnesses therein controlled by our improved mechan sm;

Figure 2is an enlarged sectional view illus- 'tratin'g the cylinder and its co-operating parts; i Figure 3 is aview similar to Figure 2 with parts removed showing another positionof the mechanism t Figure 4 is a View similar to Figure 2 with parts eliminated showing another position of the parts; i I

Figure 5 is a sectional plan view of the mechanism shown in FiguresQ, 3 and i.

A represents the loom frame and B the harnesses. C represents the harness jacks fulcrumed between their endson a rod 1.

The upper ends of the acks C are operativeif I ly connected tothe upper portions of the harnesses B through the medium of flexible connecting devices 2 passed over idle pulleys 8 on the frame A, and the lower ends of the T cured to one end thereof and operated by" any desired power transmitting mechanism. This cylinder D controls the longitudinal movement of a series of connectors E. These connectors E are pivotally connected to the upper portions of the harness jacks C, as indicated at 8, and at their other ends are forked or bifurcated, each furcation having a rack 9 thereon. 1

The upper furcation of the connector E has its rack 9 on its lower face, and the lower furcation of the connector E has its rack 9 on its upper face, and these racks are spaced apart a distance greater than the diameter of the cylinder D so that only one rack may be in engagement with the cylinder at the same time.

Below each connector E is a lifter F pivotally supported at one end on a rod 10, and

these lifters are moved vertically by a pattern chain 11. Each connector E at the end of its lower furcation is pivotally connected by a curved link 12, and each curvedlink 12 is connected by a pivotpin 13 with a link 14L having turning motion on a rod 15 intermediate the ends of the link 14. This arrangement of links 12 and 14 with their pivots constitute a lock to hold the harnesses in their elevated or lowered positions for a desired length of time.

Each lifter F has a cushioned finger 16 thereon to engage one end of the link 14 to lift the pivot pin 13 above the plane of the other pivots of thelinks to break the lock and allow the connector to move longitudinally.

The: link 14 at its free end has a shoulder 17 adapted to engage undera tongue 18 on the connector E so as to limit the pivotal movement of the link in one direction. The

operationor thislocking mechanism will be more fully hereinafter pointed out.

Above the series of connectors E pivotec tension levers G are located and have springs 19 exerting pressure thereon, to. force .the.

levers G downwardly againstthe connectors Ewhen-permitted.

The levers; G have fingers'20 at one end under which a sliding block- 21mounted ina guide 22. is adapted-to move to hold the levers elevated. This blo'ckl2l. extends entirely across, the; machine, operating all of the levers Gat .one time. Thisslidingblock 21 is p eratedbya linkfl22j com ectedv ,toa crank .arnr23 on a sl1a;t t12 i.; Asecond; crank arm25 on the shaft 24 is connected by a link 26 to a lever 27 pivotally supported between its ends, as shown at 28, and carrying a .roller 29..-at one end held-in engagement with a cam 30. on a cam-shaft :31 which-is turned continuously and in synchronisnr with the movement. of cylinder D through mechani cal means. A spring 31 connects the lever ing movement of the harness..-'.' It-avill be notedtliat .inithis figures-of the-drawings the pattern chain ll and the finger- 16 thereon havemoved thepivots 13 13 or" the; links 12 and-1a to'a .pointtabeve the horizontal plane-rot theother pivots of these links so that the lock is; brokenand the connector E isrfnee to movejto the leit'of Figure 2,. Fun.

thermore, the lifter F has;moved.the.aconnector- E upwardly so that the lower rack 9 is-engagedzby the teeth oi the-cylinder. As the cylinder revolves in sthe direction of the arrow it. will; move the: [connector E to, the left.- and cause the .jack Gto swing on its pivot 1, and as this motion. continues the harnessBuvill bemevedupwardly. As the connector E reaches-theextremeotits move- -ment in this directionttlielinks-12 and let will swing on theirrpivots to the position shown in Figure 3, ringing the: several pivots of-sa-id links into substantial alinement and forming a positive lockto prevent movement longitudinally of the'connector E in either direction. The harness is thus maintained in elevated position as long as desired.

When the pattern chain 11 permits and the power mechanism has been operated to move the camBO to a position to release the block 21 from thetension lever G, the spring 19 of this tension lever will force the lever downwardly, pressingthe connector E downwardly and bringing'the upper rack 9 into mesh with the teeth of-the cylinder D. As the connector is forced downwardly, the finger 16 on the selector F engages the link 12 and moves the same to a position to move the pivots of the locking mechanism out 01 alinement-toallow the connector E to again move. The rotation of the cylinder D will then cause the connector E to move to the right of Figure 2, swinging theack C in a directionto positively draw the harness B downwardly, and as the harness reaches its downwardposition the locking mechanism pressing the links 12 and 14 will move to theposition shown in Figure 4 with the pivots in such alignment as to hold the parts against movement. When the connector E is again lifted the tension levers G willbeelevated and the block 21 moved to-a position to-holdthem elevated, as indicated in Figure 2, so that there will be no downward pressure on the connectors E.

It will thus be noted thatin our improved mechanism a single cylinder turning always in the same direction imparts: positive movement to the harnesses of the loomto move them inboth directions, and locking means is provided for holding them for a predetermined length of time in-either position.

Various changes andalterations might be made in the general form of the parts described without departing from our invention and hence we do not limit ourselves to the precise details set forth but consider .ourselves'at liberty to make such changes and links: pivotally connected to the connector and the other to the rod, the pivotal connection between the links movable out of: alinement with the other pivots of the. links to lock the connectors in both of their extreme positions, and means for moving the pivotal connection of the links to permit the movement ofthe connector.

I 2. A head motion fornloomsy including connectors operatively connected to the harness of the loom, a single toothed cylinder for moving the connectors in both directions, racks on the upper and lower portions of the connectors, a pattern chain for elevating the connectors to cause the lower racks to engage the cylinder, spring-pressed levers exerting pressure on the connectors to force the upper racks of the connectors into mesh with the cylinder, and a cam operated holding device for engaging the levers to hold them elevated when the lower rack is in engagement with the cylinder. 7

3. In a head motion for looms having a revoluble gear, and a harness jack-connector having a rack engageable with the gear to move the connector in one direction; locking means joined with the connector depending on the complete movement of the connector in said one direction for the assumption of the locking position.

4. In a head motion for looms having a gear and a harness jack-connector having a rack engageable with the gear to move the connector in one direction; articulated looking means including pivoted members joined with the connector, and means to act on the connector to disengage the rack from the gear at the end of its movement and swing said members into a position of registration of the pivots to lock the connector in the shifted position.

5. In a head motion for looms having a harness j ack-connector with racks in confronting positions, a gear revoluble between the racks, and means to shift the connector in one direction thus to engage one of the racks with the gear for a forward motion of the connector; locking means joined with the connector dependent on the movement of the connector to the limit in said direction to as sume the locking position, and means to shift the connector in the opposite direction to engage the other rack with the gear and thereby break the lock preparatory to the return movement of the connector.

6. In a head motion for looms having a harness jack-connector capable of end movement and having a rack, anda continuously revoluble gear respecting which the rack is initially spaced; a rod, and a pair of links pivoted to each other, one being pivoted to the rack the other turnably mounted on the rod assuming a position of alinement of the rod and pivots in the initial position of the rack to lock the connector against said end movement. 7

7 In a head motion for looms having a harness jack-connector capable of end movement and having a rack, and a continuously revoluble gear respecting which the rack is initially spaced; a rod, a pair of links pivoted to each other, one being pivoted to the rack the other turnably mounted on the rod assuming a position of alinement of the rod and pivots in the initial position of the rack to lock the connector against saidend movement, means for moving the rack from said initial position into engagement with the gear, and means for simultaneously kicking the pivot of the links out of alinement.

8. In a head motion for looms, a harness jack-connector having a rack, a tongue on the rack, a rod, a link turnable on the rod and having a shoulder, means joining said turnable link with the rack, and a revoluble gear with which the rack is engageable to the connector to cause said engagement of the rack and yield to the disengagement of the rack, thus assuming either of two posi tions in respect to the gear, and a reciprocable lock to hold the lever in its respective positions.

11. In a head motion for looms, a revoluble gear, a harness jack-connector having a rack engageable and disengageable with the gear, a spring-pressed lever continuously bearing on part of the connector, causing said engagement and yielding to the subsequent disengagement of the rack thereby shifting between two positions, a finger on the lever, and a lock reciprocable in respect to the lever thus alternately engaging opposite sides of the finger to temporarily hold the lever in its shifted positions.

JOEL HAROLD ATWOOD.

CARL S. PROCTOR. 

